package com.gzit.example;

import android.app.Activity;
import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.LinearGradient;
import android.graphics.Paint;
import android.graphics.Path;
import android.graphics.RectF;
import android.graphics.Shader;
import android.os.Bundle;
import android.view.View;

class GraphicShowView extends View {
	public GraphicShowView(Context context) {
		super(context);
	}

	/* 重写onDraw（） */
	@Override
	protected void onDraw(Canvas canvas) {
		super.onDraw(canvas);
		/* 设置背景为白色 */
		canvas.drawColor(Color.WHITE);

		Paint paint = new Paint();
		/* 去锯齿 */
		paint.setAntiAlias(true);
		/* 设置paint的颜色 */
		paint.setColor(Color.RED);
		/* 设置paint的 style 为STROKE：空心 */
		paint.setStyle(Paint.Style.STROKE);
		/* 设置paint的外框宽度 */
		paint.setStrokeWidth(3);

		/* 画一个空心圆形 */
		canvas.drawCircle(40, 40, 30, paint);
		/* 画一个空心正方形 */
		canvas.drawRect(10, 90, 70, 150, paint);
		/* 画一个空心长方形 */
		canvas.drawRect(10, 170, 70, 200, paint);
		/* 画一个空心椭圆形 */
		canvas.drawOval(new RectF(10, 220, 70, 250), paint);
		/* 画一个空心三角形 */
		Path path = new Path();
		path.moveTo(10, 330);
		path.lineTo(70, 330);
		path.lineTo(40, 270);
		path.close(); // 画未关闭的图形时，必须用close关闭提交线条，之后才能画得出来
		canvas.drawPath(path, paint);
		/* 画一个空心梯形 */
		Path path1 = new Path();
		path1.moveTo(10, 410);
		path1.lineTo(70, 410);
		path1.lineTo(55, 350);
		path1.lineTo(25, 350);
		path1.close();
		canvas.drawPath(path1, paint);

		/* 设置paint的颜色 */
		paint.setColor(Color.BLUE);
		/* 设置paint 的style为 FILL：实心 */
		paint.setStyle(Paint.Style.FILL);
		/* 画一个实心圆 */
		canvas.drawCircle(120, 40, 30, paint);
		/* 画一个实心正方形 */
		canvas.drawRect(90, 90, 150, 150, paint);
		/* 画一个实心长方形 */
		canvas.drawRect(90, 170, 150, 200, paint);
		/* 画一个实心椭圆 */
		RectF re2 = new RectF(90, 220, 150, 250);
		canvas.drawOval(re2, paint);
		/* 画一个实心三角形 */
		Path path2 = new Path();
		path2.moveTo(90, 330);
		path2.lineTo(150, 330);
		path2.lineTo(120, 270);
		path2.close();
		canvas.drawPath(path2, paint);
		/* 画一个实心梯形 */
		Path path3 = new Path();
		path3.moveTo(90, 410);
		path3.lineTo(150, 410);
		path3.lineTo(135, 350);
		path3.lineTo(105, 350);
		path3.close();
		canvas.drawPath(path3, paint);

		/* 设置渐变色 */
		Shader mShader = new LinearGradient(0, 0, 100, 100, new int[] {
				Color.RED, Color.GREEN, Color.BLUE, Color.YELLOW }, null,
				Shader.TileMode.REPEAT);
		// Shader.TileMode三种模式
		// REPEAT:沿着渐变方向循环重复
		// CLAMP:如果在预先定义的范围外画的话，就重复边界的颜色
		// MIRROR:与REPEAT一样都是循环重复，但这个会对称重复
		paint.setShader(mShader);// 用Shader中定义定义的颜色来画

		/* 画一个渐变色圆 */
		canvas.drawCircle(200, 40, 30, paint);
		/* 画一个渐变色正方形 */
		canvas.drawRect(170, 90, 230, 150, paint);
		/* 画一个渐变色长方形 */
		canvas.drawRect(170, 170, 230, 200, paint);
		/* 画一个渐变色椭圆 */
		RectF re3 = new RectF(170, 220, 230, 250);
		canvas.drawOval(re3, paint);
		/* 画一个渐变色三角形 */
		Path path4 = new Path();
		path4.moveTo(170, 330);
		path4.lineTo(230, 330);
		path4.lineTo(200, 270);
		path4.close();
		canvas.drawPath(path4, paint);
		/* 画一个渐变色梯形 */
		Path path5 = new Path();
		path5.moveTo(170, 410);
		path5.lineTo(230, 410);
		path5.lineTo(215, 350);
		path5.lineTo(185, 350);
		path5.close();
		canvas.drawPath(path5, paint);

		/* 写字 */
		paint.setTextSize(24);
		canvas.drawText("圆形", 240, 50, paint);
		canvas.drawText("正方形", 240, 120, paint);
		canvas.drawText("长方形", 240, 190, paint);
		canvas.drawText("椭圆形", 240, 250, paint);
		canvas.drawText("三角形", 240, 320, paint);
		canvas.drawText("梯形", 240, 390, paint);
	}
}

// 主程序中继承自Android.view.View的 MyView类，重写 MyView的onDraw（）方法，
// 一开始就会运行绘制的工作，在onDraw（）中以Paint将几何图形绘制在Canvas上，
// 以 paint.setColor() 改变图形颜色、以 paint.setStyle()的设置来控制画出的的
// 图形是空心还是实心。程序的最后一段，就是直接在Canvas写上文字，随着Paint对
// 象里的属性设置，也会有不同的外观模式。
public class GraphicesActivity extends Activity {

	@Override
	public void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		/* 设置ContentView为自定义的MyVieW */
		GraphicShowView myView = new GraphicShowView(this);
		setContentView(myView);
	}

}